I really care about Kanto, especially the grasslands where I play with my friends. I may not be fast, but I will always be the first ^^
Oh and there is a hidden garden in Kanto where I can evolve!
I care about pokemon too, of course, there’s even a caring technique called after me!

The spotlights are blinding me. I close my eyes and wait for the music to start. A banjo breaks the silence with short but fierce chords. I start dancing slowly, but as the song progresses I put more and more force in my movements. I feel my big earrings swinging along. Each step makes my black and red dress glitter in the light, the long tail following wherever I go. Passion guides me through this dance, the force of the song drives my body. I almost fly across the stage during the last crescendo and let me fall on the last note, my dress covering the stage. I hear the crowd cheering. I look up and see countless red roses flying my direction. This is what I live for...

Chingling or Chimeco
The first pic turned out to be chosen badly but the cow refered to a cowbell, and he was calling with earth and a phone and a bell both rings (Chingling is a Bell Pokemon).
The second pic was about the japanese lamps hanging there, which represented Chimeco, also the colours were present in this pic.
In the third pic you could see a church with bells. Also the psychic type could be found by this pic.
The fourth pic was just about the colours. Chingling has this red & white rope, which was also visible on the pic.

"Deep beneath the grainy sand" / "In arid dune": that means the pokemon is something that resides in a desert like climate.
"Within you my toxins flow": this means the pokemon has to be a poison type or at least is capable of learning poison moves like toxic
"with keenest eye": a pokemon that has the ability Keen Eye
"But I aided The Rock in his time of need" / "By offering my (small typo, I'm assuming WingedGolem meant 'my' not 'by' body to feed": In the Mummy 2 Dwayne "The Rock" Johnson's character ate a scorpion to try and survive in the opening scene

So that means the pokemon described in the riddle is a poison type that has the ability keen eye that lives in a desert-like environment and has to have scorpion-like characteristics. The only four pokemon remotely resembling a scorpion and that would be Skorupi and its evolved form Drapion and Gligar and its evolved form Gliscor. Skorupi resembles a scorpion far more than the other three and its pokedex entries make it fit with the rest of the riddle as it mentions it lives in an arid environment and its tail is used to inject its prey with poison.

Sorry this explanation is pretty long but I wanted to make sure I wasn't forgetting anything
-------------------
Loved this answer, thank you hina <3

Porygon is a manmade pokemon that has basic emotions and is capable of traveling through cyberspace. It was soon upgraded to Porygon2. This pokemon had more advanced emotions that its first form and was meant to explore deep space something it's not capable of doing just yet. So it was upgraded yet again. Except something went wrong and the pokemon began acting strangely. The pokemon developed a glitch or a virus and thus became Porygon-Z.
The original message had words spelled backwards from how they are usually spelled. When fixed it goes like this:

I don’t like humans
They make me go insane
Well I guess it’s too late now
I wish they had just left me alone
I hope you will leave too

"They make me go insane" could mean the upgrade used on Porygon2 to make it more advanced that turned it into Porygon-Z
"it's too late now" means that it can't turn back and evolutions can't be reversed once the pokemon is done changing
"I wish they had just left me alone" could mean that Porygon2 had been fine the way it was but the scientists wishing to make it more advanced, changed it against its will

And the fact this was sent as a PM or electronic message means this is a pokemon capable of using the internet or in this case, traveling through the internet

It's Masquerain.
I know the whole riddle was very vague, I kinda messed up and the answers I got sometimes had a good reason backing the answer (Like Larvesta and Cherrim in it's Sunny forme)
Masquerain is a bug/water type, so it doesn't like to see people catching it's friends => he looks sad
If it's going to rain Masquerain will look sad, so yeah that were the only two (or 3 if you count the water type thing) poor clues, oh well, sorry again xD

The sun is shining bright when I get up. I go to the kitchen and start eating cereals. I see my little brother running around outside. I look into my spoon and see myself upside down. Hmm, I see I have a little moustache again, guess I’ll shave after breakfast.
“Mom says you mustn’t eat cereals at this hour”, my brother says.
“Huh what, oh, I thought you were outside. Yeah sure, I’ll get some toast.”
I quickly put a spoonful of cereal in my mouth and stand up. I see he’s outside again. God, he’s faster than wind sometimes. I put a couple of slices in the toaster and pop it down, followed by a flash and a bang.

Abra / Kadabra (or Alakazam who lost a spoon I guess)
This one was pretty obvious, the spoon, the moustache, the little kid that teleports everywhere ^^
Oh and the pokedex entry for Silver: "If it uses its abilities, it emits special alpha waves that cause machines to malfunction."
So that explains the last part (=

Not many people like me, I’m just a little part of the life cycle. I used to be hard as steel but here I’ve been given a new, softer skin. It made me more popular but I think I should harden up again. Well, I should be going now, need to get my hands on an everstone before I evolve, good bye!

Metapod / Metacream.
In the pokemon games fighting a Metapod or trying to evolve a Metapod is a pain, so I don't think many people like this pokemon. Luckily it only has 3 levels, so it's only a very short part of it's life cycle.
Here on PokeHeroes Metapod has gotten a new skin, Metacream, which made him a lot more popular. Metapod uses the move Harden all the time, so he will do it again.
Here on PokeHeroes it's also a pain to get a Metapod because you mustn't forget the everstone for just a moment.

MOM!
Sweat is dripping from my face, my whole body shivering.
I had another nightmare, she died again… Mom died again.
She died when I got born, it made dad fall in a quite deep depression. He raised me on his own, and still does. I’m very grateful for that.
The only thing that reminds me of mom is her bracelet I always wear, even when I was a little kid. And the nightmares of course. I see mom die over and over again, every time in a different way.
I always think I got used to it, that I can live with this burden, but every nightmare proves me wrong. Every time again hearing the cries, seeing the blood, shouting for mom...
I hear dad in the hallway, he must’ve heard me shout for mom. I reach for the light when a striking pain shoots through my arm. Blood runs from under mom’s bracelet. Maybe it’s time to get rid of it...

Cubone
"She died when I got born"
=> Crystal dex: "It lost its mother after its birth"
"The only thing that reminds me of mom is her bracelet I always wear, even when I was a little kid"
=> Silver dex: "It always wears the skull of its dead mother"
"Every time again hearing the cries, seeing the blood, shouting for mom..."
=> Diamond dex:
"When it thinks of its dead mother, it cries."
The rest just adds to the story ^^

The yearly Emera Carnival is about to start. My sister is already waiting for me outside. “Come on, Bruno! We’ll be late!”
“I’ll be right there, just going to get my mask!” I run upstairs and grab the mask I bought in a little shop of a fortune teller.
As I walk out of the front door the sun blinds me. My sister smiling at me with her wonderful mask. It has big, puffy white feathers all around her face with a few small colored ones. Eight slim golden feathers run between the white ones. She really looks like a big, beautiful flower dazzling in the sun.
“Finally, any longer and we’d miss the opening ceremony!”
“Yeah, I know, sorry..” I mumble while I put the mask on.
A sudden darkness literally slams my head. My sister turns around and looks at me. Her flower is dark and looks rotten. Her worried face changes and starts to look like a screaming beast but there is no sound. The only thing I hear is the irregular beating of my own heart. I put a step back, lose balance and fall backwards.
I think I hit my head, but somehow it made me feel better. The world lights up again and my heart slowly returns to a normal pace.
I open my eyes and see a rather irritated sister.
“Okay, you’ve done it this time. Now we’re really going to miss the opening ceremony!”
“No, it’s okay, I can go, I feel fine again!” I say while I try to get up. “Oh.. The mask broke..”